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Check before starting and after every 5 hours of operation. BE SURE OIL LEVEL IS MAINTAINED.

2.  CHANGE OIL (Crankcase)

Change oil after first 5 hours of operation. Thereafter change oil every 25 hours of operation. Remove the oil drain plug. Drain oil while engine is warm. Remove oil filler cap or plug and refill with new oil. Replace oil filler cap or plug. Add oil regularly after each 5 hours of operation.


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Clean and re-oil foam pre-cleaner at 3 month intervals or every 25 hours, whichever occurs first.
1. Remove upper wing nut and cover.
2. Remove foam pre-cleaner element by sliding it up off of the paper cartridge.
3. A - Wash foam in liquid detergent and water. 
    B - Squeeze dry.
    C - Oil with one ounce engine oil. Squeeze to distribute oil evenly.
4. Install foam element over paper cartridge. Reassemble Cover and wing nut. Screw wing nut down tight.

Yearly or every 1010 hours, whichever occurs first, remove paper cartridge. Clean by tapping gently on flat surface. If very dirty, replace cartridge, or wash in liquid detergent and water. Rinse until water remains clear. Cartridge must be air dried thoroughly before using.
NOTE: Service more often under dusty conditions.

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Clean Air Cleaner


Grass or chaff may clog cooling system after prolonged service in cutting dry grasses or hay. Continued operation with a clogged cooling system causes severe overheating and possible engine damage. Remove blower housing and clean regularly.

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5.  CLEAN COMBUSTION CHAMBER every 100-300 hours of operation. If the engine operates at constant speed and at relatively constant load, the use of regular automotive fuels results in a gradual build-up of lead deposits in the combustion chamber.

This causes the engine to lose power and prevents the valves from seating properly. Removing the deposits is easy and will pay big dividends in reliability and increased valve life.
1. Remove cylinder head screws.
2. Turn crankshaft until piston is at top of cylinder bore and both valves are closed. Scrape and wire brush the lead and carbon deposits from cylinder head and combustion chamber.
3. Re-use cylinder head gasket only if in good condition. Replace cylinder head. Turn each screw in with wrench until screw head is lightly seated.
4. Use socket wrench with 6 inch handle and turn all screws 1/4 turn. Tighten screws in sequence illustrated. Run engine approximately 5 minutes and retighten all screws approximately 1/4 turn.

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[Source:  Briggs & Stratton Operating and Maintenance Instructions, Models 243431 to 243434, Form No. 27030 - 74.]



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